Western Digital’s student web store has 20% discounts or more on all their drives. WD Red 4TB normally $149, discounted to $95 with student account (requires .edu email address). Shipping was an additional $5.76 for me.
This discount applies to all drives. The only limitation is you can only order 1 drive at a time, at least with the 4TB I just ordered.
https://www.wdc.com/shop/student-store.html